@@ -268,6 +268,7 @@ int kvm_smccc_call_handler(struct kvm_vcpu *vcpu)
u32 feature;
u8 action;
gpa_t gpa;
+ uuid_t uuid;
action = kvm_smccc_get_action(vcpu, func_id);
switch (action) {
@@ -353,10 +354,11 @@ int kvm_smccc_call_handler(struct kvm_vcpu *vcpu)
val[0] = gpa;
break;
case ARM_SMCCC_VENDOR_HYP_CALL_UID_FUNC_ID:
- val[0] = ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_0;
- val[1] = ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_1;
- val[2] = ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_2;
- val[3] = ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_3;
+ uuid = ARM_SMCCC_VENDOR_HYP_UID_KVM;
+ val[0] = smccc_uuid_to_reg(&uuid, 0);
+ val[1] = smccc_uuid_to_reg(&uuid, 1);
+ val[2] = smccc_uuid_to_reg(&uuid, 2);
+ val[3] = smccc_uuid_to_reg(&uuid, 3);
break;
case ARM_SMCCC_VENDOR_HYP_KVM_FEATURES_FUNC_ID:
val[0] = smccc_feat->vendor_hyp_bmap;
@@ -14,17 +14,11 @@ static DECLARE_BITMAP(__kvm_arm_hyp_services, ARM_SMCCC_KVM_NUM_FUNCS) __ro_afte
void __init kvm_init_hyp_services(void)
{
+ uuid_t kvm_uuid = ARM_SMCCC_VENDOR_HYP_UID_KVM;
struct arm_smccc_res res;
u32 val[4];
- if (arm_smccc_1_1_get_conduit() != SMCCC_CONDUIT_HVC)
- return;
-
- arm_smccc_1_1_invoke(ARM_SMCCC_VENDOR_HYP_CALL_UID_FUNC_ID, &res);
- if (res.a0 != ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_0 ||
- res.a1 != ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_1 ||
- res.a2 != ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_2 ||
- res.a3 != ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_3)
+ if (!arm_smccc_hypervisor_has_uuid(&kvm_uuid))
return;
memset(&res, 0, sizeof(res));
@@ -67,6 +67,23 @@ s32 arm_smccc_get_soc_id_revision(void)
}
EXPORT_SYMBOL_GPL(arm_smccc_get_soc_id_revision);
+bool arm_smccc_hypervisor_has_uuid(const uuid_t *hyp_uuid)
+{
+ struct arm_smccc_res res = {};
+ uuid_t uuid;
+
+ if (arm_smccc_1_1_get_conduit() != SMCCC_CONDUIT_HVC)
+ return false;
+
+ arm_smccc_1_1_hvc(ARM_SMCCC_VENDOR_HYP_CALL_UID_FUNC_ID, &res);
+ if (res.a0 == SMCCC_RET_NOT_SUPPORTED)
+ return false;
+
+ uuid = smccc_res_to_uuid(res.a0, res.a1, res.a2, res.a3);
+ return uuid_equal(&uuid, hyp_uuid);
+}
+EXPORT_SYMBOL_GPL(arm_smccc_hypervisor_has_uuid);
+
static int __init smccc_devices_init(void)
{
struct platform_device *pdev;
@@ -7,6 +7,11 @@
#include <linux/args.h>
#include <linux/init.h>
+
+#ifndef __ASSEMBLY__
+#include <linux/uuid.h>
+#endif
+
#include <uapi/linux/const.h>
/*
@@ -107,10 +112,10 @@
ARM_SMCCC_FUNC_QUERY_CALL_UID)
/* KVM UID value: 28b46fb6-2ec5-11e9-a9ca-4b564d003a74 */
-#define ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_0 0xb66fb428U
-#define ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_1 0xe911c52eU
-#define ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_2 0x564bcaa9U
-#define ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_3 0x743a004dU
+#define ARM_SMCCC_VENDOR_HYP_UID_KVM UUID_INIT(\
+ 0xb66fb428, 0xc52e, 0xe911, \
+ 0xa9, 0xca, 0x4b, 0x56, \
+ 0x4d, 0x00, 0x3a, 0x74)
/* KVM "vendor specific" services */
#define ARM_SMCCC_KVM_FUNC_FEATURES 0
@@ -333,6 +338,57 @@ s32 arm_smccc_get_soc_id_version(void);
*/
s32 arm_smccc_get_soc_id_revision(void);
+#ifndef __ASSEMBLY__
+
+/*
+ * Returns whether a specific hypervisor UUID is advertised for the
+ * Vendor Specific Hypervisor Service range.
+ */
+bool arm_smccc_hypervisor_has_uuid(const uuid_t *uuid);
+
+static inline uuid_t smccc_res_to_uuid(u32 r0, u32 r1, u32 r2, u32 r3)
+{
+ uuid_t uuid = {
+ .b = {
+ [0] = (r0 >> 0) & 0xff,
+ [1] = (r0 >> 8) & 0xff,
+ [2] = (r0 >> 16) & 0xff,
+ [3] = (r0 >> 24) & 0xff,
+
+ [4] = (r1 >> 0) & 0xff,
+ [5] = (r1 >> 8) & 0xff,
+ [6] = (r1 >> 16) & 0xff,
+ [7] = (r1 >> 24) & 0xff,
+
+ [8] = (r2 >> 0) & 0xff,
+ [9] = (r2 >> 8) & 0xff,
+ [10] = (r2 >> 16) & 0xff,
+ [11] = (r2 >> 24) & 0xff,
+
+ [12] = (r3 >> 0) & 0xff,
+ [13] = (r3 >> 8) & 0xff,
+ [14] = (r3 >> 16) & 0xff,
+ [15] = (r3 >> 24) & 0xff,
+ },
+ };
+
+ return uuid;
+}
+
+static inline u32 smccc_uuid_to_reg(const uuid_t *uuid, int reg)
+{
+ u32 val = 0;
+
+ val |= (u32)(uuid->b[4 * reg + 0] << 0);
+ val |= (u32)(uuid->b[4 * reg + 1] << 8);
+ val |= (u32)(uuid->b[4 * reg + 2] << 16);
+ val |= (u32)(uuid->b[4 * reg + 3] << 24);
+
+ return val;
+}
+
+#endif /* !__ASSEMBLY__ */
+
/**
* struct arm_smccc_res - Result from SMC/HVC call
* @a0-a3 result values from registers 0 to 3